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<head><meta charset="utf-8"><title>weekly meeting June 26 · t-compiler/wg-nll · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/index.html">t-compiler/wg-nll</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html">weekly meeting June 26</a></h3>

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<a name="128675052"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675052" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675052">(Jun 26 2018 at 19:35)</a>:</h4>
<p><span class="emoji emoji-1f44b" title="wave">:wave:</span></p>



<a name="128675133"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675133" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> qmx <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675133">(Jun 26 2018 at 19:36)</a>:</h4>
<p>I've been swamped with work, and besides that been working on some non-nll things (edition-related stuff)</p>



<a name="128675136"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675136" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> qmx <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675136">(Jun 26 2018 at 19:36)</a>:</h4>
<p>so just lurking here</p>



<a name="128675155"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675155" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675155">(Jun 26 2018 at 19:37)</a>:</h4>
<p>ok so</p>



<a name="128675158"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675158" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675158">(Jun 26 2018 at 19:37)</a>:</h4>
<p>a couple of things</p>



<a name="128675169"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675169" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675169">(Jun 26 2018 at 19:37)</a>:</h4>
<p>first of all, you may have noticed that <span class="user-mention" data-user-id="116083">@pnkfelix</span> hasn't been around — for personal reasons, he's got to be away, not sure when he'll be back</p>



<a name="128675173"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675173" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675173">(Jun 26 2018 at 19:38)</a>:</h4>
<p>hopefully soon</p>



<a name="128675223"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675223" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675223">(Jun 26 2018 at 19:38)</a>:</h4>
<p>secondly, I spent a long time this morning doing profiles and investigations</p>



<a name="128675249"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675249" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675249">(Jun 26 2018 at 19:38)</a>:</h4>
<p>if you go to <a href="https://paper.dropbox.com/doc/Non-lexical-lifetimes-NLL-Triage-Em2cJrvxQMMFWLE7lE5Be" target="_blank" title="https://paper.dropbox.com/doc/Non-lexical-lifetimes-NLL-Triage-Em2cJrvxQMMFWLE7lE5Be">the "next steps" section of the triage document</a></p>



<a name="128675257"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675257" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675257">(Jun 26 2018 at 19:39)</a>:</h4>
<p>you'll see that I wrote out a bunch of ways we can improve performance</p>



<a name="128675268"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675268" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675268">(Jun 26 2018 at 19:39)</a>:</h4>
<p>mostly small, but afaict there is no single "home run" available to us at this point</p>



<a name="128675276"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675276" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675276">(Jun 26 2018 at 19:39)</a>:</h4>
<p>at the moment the most promising thing seems to be making a series of small improvements</p>



<a name="128675280"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675280" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675280">(Jun 26 2018 at 19:39)</a>:</h4>
<p>but I think there are still plenty of opportunities</p>



<a name="128675284"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675284" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675284">(Jun 26 2018 at 19:39)</a>:</h4>
<p>cool</p>



<a name="128675287"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675287" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675287">(Jun 26 2018 at 19:39)</a>:</h4>
<p>and maybe once we're done, we'll see some bigger things we can do</p>



<a name="128675291"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675291" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675291">(Jun 26 2018 at 19:39)</a>:</h4>
<p>or we'll just be done :)</p>



<a name="128675293"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675293" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675293">(Jun 26 2018 at 19:39)</a>:</h4>
<p>are you going to open issues about all this stuff?</p>



<a name="128675295"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675295" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675295">(Jun 26 2018 at 19:39)</a>:</h4>
<p>already done</p>



<a name="128675340"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675340" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675340">(Jun 26 2018 at 19:40)</a>:</h4>
<p>they are linke from the document</p>



<a name="128675347"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675347" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675347">(Jun 26 2018 at 19:40)</a>:</h4>
<p>ahh I see the document now</p>



<a name="128675351"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675351" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675351">(Jun 26 2018 at 19:40)</a>:</h4>
<p>or available with <a href="https://github.com/rust-lang/rust/labels/NLL-performant" target="_blank" title="https://github.com/rust-lang/rust/labels/NLL-performant">the NLL-performant label</a></p>



<a name="128675366"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675366" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675366">(Jun 26 2018 at 19:40)</a>:</h4>
<p>you're assigned to one of them <span class="user-mention" data-user-id="116266">@Santiago Pastorino</span> :)</p>



<a name="128675376"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675376" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675376">(Jun 26 2018 at 19:40)</a>:</h4>
<p>yep :)</p>



<a name="128675402"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675402" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675402">(Jun 26 2018 at 19:41)</a>:</h4>
<p>are you going to keep profiling stuff?</p>



<a name="128675408"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675408" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675408">(Jun 26 2018 at 19:41)</a>:</h4>
<p>I would like to dig into at least one other test case</p>



<a name="128675410"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675410" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675410">(Jun 26 2018 at 19:41)</a>:</h4>
<p>maybe a few more</p>



<a name="128675411"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675411" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675411">(Jun 26 2018 at 19:41)</a>:</h4>
<p>this is all from clap-rs</p>



<a name="128675415"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675415" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675415">(Jun 26 2018 at 19:41)</a>:</h4>
<p>another thing is that I want to start making a big push to grow the WG</p>



<a name="128675426"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675426" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675426">(Jun 26 2018 at 19:42)</a>:</h4>
<p>my sense is that -- for various reasons -- we've had a kind of attrition over time</p>



<a name="128675478"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675478" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675478">(Jun 26 2018 at 19:42)</a>:</h4>
<p>such that the set of active hacking people is starting to get low :)</p>



<a name="128675482"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675482" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675482">(Jun 26 2018 at 19:42)</a>:</h4>
<p>:(</p>



<a name="128675497"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675497" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675497">(Jun 26 2018 at 19:42)</a>:</h4>
<p>if you have any suggestions, I'm all ears, my first step was just this tweet :)</p>
<p><a href="https://twitter.com/nikomatsakis/status/1011681895221022720" target="_blank" title="https://twitter.com/nikomatsakis/status/1011681895221022720">https://twitter.com/nikomatsakis/status/1011681895221022720</a></p>
<div class="inline-preview-twitter"><div class="twitter-tweet"><a href="https://twitter.com/nikomatsakis/status/1011681895221022720" target="_blank"><img class="twitter-avatar" src="https://pbs.twimg.com/profile_images/1577044478/Me-2011_normal.jpeg"></a><p>Interested in helping out with NLL? We have our weekly triage meeting TODAY at 15:30 "Boston time" on Zulip (i.e., about 45 minutes from now): <a href="https://t.co/njy9h8obEt" target="_blank" title="https://t.co/njy9h8obEt">https://rust-lang.zulipchat.com/#narrow/stream/122657-wg-nll</a> -- or, if that doesn't work for you, I plan to update an internals thread, will post a link after. #rustlang</p><span>- Niko Matsakis (@nikomatsakis)</span></div></div>



<a name="128675506"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675506" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675506">(Jun 26 2018 at 19:42)</a>:</h4>
<p>not just if any people are here because of it (if so, Hi!)</p>



<a name="128675509"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675509" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675509">(Jun 26 2018 at 19:42)</a>:</h4>
<blockquote>
<p>I would like to dig into at least one other test case</p>
</blockquote>
<p>I've asked because I'd like to see you going over stuff, may be helpful</p>



<a name="128675518"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675518" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675518">(Jun 26 2018 at 19:43)</a>:</h4>
<p>yeah would be happy to do it "live" with a few others</p>



<a name="128675521"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675521" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675521">(Jun 26 2018 at 19:43)</a>:</h4>
<p>I was actually contemplating that just for fun</p>



<a name="128675524"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675524" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> davidtwco <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675524">(Jun 26 2018 at 19:43)</a>:</h4>
<p>I'd like to start picking up some more tasks, not taken on a lot in the past few weeks, I've reckon I've got the bandwidth for more.</p>



<a name="128675555"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675555" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675555">(Jun 26 2018 at 19:43)</a>:</h4>
<p>ok, sounds great, main thing is: I would say don't sign up for stuff unless you are actively hacking on it</p>



<a name="128675556"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675556" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675556">(Jun 26 2018 at 19:44)</a>:</h4>
<p>to keep the pool of things open for otherse</p>



<a name="128675606"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675606" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675606">(Jun 26 2018 at 19:44)</a>:</h4>
<p>I'm sure we can create more tasks if you feel like you are running low</p>



<a name="128675611"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675611" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675611">(Jun 26 2018 at 19:44)</a>:</h4>
<p>one challenge here is that I've been finding it hard to keep up with writing mentoring instructions, but I decided to just do a less good job ;)</p>



<a name="128675620"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675620" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> lqd <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675620">(Jun 26 2018 at 19:44)</a>:</h4>
<p>could be nice if the official rust-lang account / Steve retweeted it for bigger reach</p>



<a name="128675623"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675623" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675623">(Jun 26 2018 at 19:44)</a>:</h4>
<p>that is, give a few pointers and see  if people can jump in and come to the channel</p>



<a name="128675647"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675647" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675647">(Jun 26 2018 at 19:45)</a>:</h4>
<p>yeah I guess steve didn't see it, seems fine, the follow-ups are prob more imp't</p>



<a name="128675652"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675652" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675652">(Jun 26 2018 at 19:45)</a>:</h4>
<p>anyway, enough of that</p>



<a name="128675662"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675662" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675662">(Jun 26 2018 at 19:45)</a>:</h4>
<p>I don't know if it makes sense to go over the performance stuff in more detail -- I'm guessing probably not? — but know that there are a number of issues and I think they're all worth doing</p>



<a name="128675713"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675713" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675713">(Jun 26 2018 at 19:46)</a>:</h4>
<p>(and we can discuss individual things in more detail on distinct topics)</p>



<a name="128675727"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675727" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675727">(Jun 26 2018 at 19:46)</a>:</h4>
<p>I didn't really get time to go over diagnostics yet</p>



<a name="128675747"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675747" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675747">(Jun 26 2018 at 19:46)</a>:</h4>
<p>but there was one other thing I wanted to talk about for sure, which was the idea of doing a crater run</p>



<a name="128675758"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675758" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675758">(Jun 26 2018 at 19:46)</a>:</h4>
<p>### Crater run</p>



<a name="128675761"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675761" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675761">(Jun 26 2018 at 19:46)</a>:</h4>
<p>/me expriemnts with section headings</p>



<a name="128675762"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675762" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675762">(Jun 26 2018 at 19:46)</a>:</h4>
<p>I think we ought to try to bootstrap rustc and do a crater run wih NLL enabled</p>



<a name="128675766"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675766" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675766">(Jun 26 2018 at 19:47)</a>:</h4>
<p>and then go over the results and look for burning bugs</p>



<a name="128675775"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675775" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675775">(Jun 26 2018 at 19:47)</a>:</h4>
<p>as well as "total diagnostic fails" :)</p>



<a name="128675779"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675779" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675779">(Jun 26 2018 at 19:47)</a>:</h4>
<p>I am actually not sure if we can do a crater run without bootstrap working</p>



<a name="128675781"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675781" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675781">(Jun 26 2018 at 19:47)</a>:</h4>
<p>and I not sure if bootstrap works (maybe it does?)</p>



<a name="128675783"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675783" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> lqd <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675783">(Jun 26 2018 at 19:47)</a>:</h4>
<p>how would one test NLL w/ bootstrapping ?</p>



<a name="128675785"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675785" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675785">(Jun 26 2018 at 19:47)</a>:</h4>
<p>but it seems like something I <em>should</em> know the answer to</p>



<a name="128675810"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675810" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675810">(Jun 26 2018 at 19:47)</a>:</h4>
<p>well, we would want to make <code>-Zborrowck=mir</code> the default</p>



<a name="128675854"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675854" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> lqd <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675854">(Jun 26 2018 at 19:48)</a>:</h4>
<p>I thought x.py check would work but I guess it's just using stage0 (ie, beta ?) — but since there was a release it might also change this</p>



<a name="128675861"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675861" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675861">(Jun 26 2018 at 19:48)</a>:</h4>
<p>ah I remember duh</p>



<a name="128675864"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675864" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675864">(Jun 26 2018 at 19:48)</a>:</h4>
<p>what I did before was</p>



<a name="128675875"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675875" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675875">(Jun 26 2018 at 19:48)</a>:</h4>
<p>we have a variable... I think it's called <code>RUSTFLAGS_NOT_STAGE0</code> or something</p>



<a name="128675878"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675878" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675878">(Jun 26 2018 at 19:48)</a>:</h4>
<p>and I did <code>RUSTFLAGS_NOT_STAGE0='-Zborrowck=mir' ./x.py build</code></p>



<a name="128675880"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675880" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675880">(Jun 26 2018 at 19:48)</a>:</h4>
<p>cc <span class="user-mention" data-user-id="116122">@simulacrum</span> are you around by any chance?</p>



<a name="128675881"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675881" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> lqd <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675881">(Jun 26 2018 at 19:48)</a>:</h4>
<p>oh right</p>



<a name="128675888"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675888" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675888">(Jun 26 2018 at 19:49)</a>:</h4>
<p><span class="user-mention" data-user-id="116122">@simulacrum</span> I'm wondering if you know whether crater can be run with custom flags</p>



<a name="128675892"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675892" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675892">(Jun 26 2018 at 19:49)</a>:</h4>
<p>ideally we would decouple bootstrap from crater run</p>



<a name="128675896"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675896" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> lqd <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675896">(Jun 26 2018 at 19:49)</a>:</h4>
<p>yeah</p>



<a name="128675897"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675897" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675897">(Jun 26 2018 at 19:49)</a>:</h4>
<p>we could potentially do that by checking the <code>RUST_BOOTSTRAP</code> env variable or something</p>



<a name="128675900"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675900" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675900">(Jun 26 2018 at 19:49)</a>:</h4>
<p>actually <em>ideally</em> bootstrap would work :)</p>



<a name="128675964"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675964" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> lqd <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675964">(Jun 26 2018 at 19:50)</a>:</h4>
<p>I started testing bootstrap last week but as you can imagine, it happens I was mostly testing the old beta's NLL :3</p>



<a name="128675971"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675971" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675971">(Jun 26 2018 at 19:50)</a>:</h4>
<p>I guess my question is:</p>
<p>Does somebody want to take charge of trying to push bootstrap through and reporting back?</p>



<a name="128675980"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675980" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> lqd <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675980">(Jun 26 2018 at 19:50)</a>:</h4>
<p>sure I can try</p>



<a name="128675981"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675981" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675981">(Jun 26 2018 at 19:51)</a>:</h4>
<p>&lt;3</p>



<a name="128675986"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675986" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675986">(Jun 26 2018 at 19:51)</a>:</h4>
<p>we should file an issue to track I guess</p>



<a name="128675993"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128675993" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128675993">(Jun 26 2018 at 19:51)</a>:</h4>
<p>the strategy I was trying to do before was</p>



<a name="128676003"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676003" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676003">(Jun 26 2018 at 19:51)</a>:</h4>
<p>to find places where bootstrap failed</p>



<a name="128676004"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676004" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676004">(Jun 26 2018 at 19:51)</a>:</h4>
<p>minimize the errors</p>



<a name="128676006"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676006" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676006">(Jun 26 2018 at 19:51)</a>:</h4>
<p>and then find workarounds :)</p>



<a name="128676009"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676009" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676009">(Jun 26 2018 at 19:51)</a>:</h4>
<p>i.e., file an issue with a minimzed example for the future</p>



<a name="128676016"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676016" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676016">(Jun 26 2018 at 19:51)</a>:</h4>
<p>we'll see how necessary that is</p>



<a name="128676019"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676019" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676019">(Jun 26 2018 at 19:51)</a>:</h4>
<p>oh shoot</p>



<a name="128676036"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676036" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676036">(Jun 26 2018 at 19:52)</a>:</h4>
<p>I am remembering now what the blocker was before</p>



<a name="128676066"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676066" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676066">(Jun 26 2018 at 19:52)</a>:</h4>
<p>I had kind of forgotten about that</p>



<a name="128676072"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676072" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676072">(Jun 26 2018 at 19:52)</a>:</h4>
<p>well, we can discuss off line :)</p>



<a name="128676082"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676082" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676082">(Jun 26 2018 at 19:52)</a>:</h4>
<p>we should find out whether we can do the crater run w/ custom flags; I'll go ask in #rust-infra on IRC</p>



<a name="128676112"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676112" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> lqd <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676112">(Jun 26 2018 at 19:53)</a>:</h4>
<p>(the env var to use for testing bootstrap is probably <code>RUSTFLAGS_STAGE_NOT_0</code>)</p>



<a name="128676198"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676198" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676198">(Jun 26 2018 at 19:54)</a>:</h4>
<p><span class="user-mention" data-user-id="116113">@lqd</span> I filed <a href="https://github.com/rust-lang/rust/issues/51823" target="_blank" title="https://github.com/rust-lang/rust/issues/51823">https://github.com/rust-lang/rust/issues/51823</a> and assigned you =)</p>



<a name="128676221"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676221" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676221">(Jun 26 2018 at 19:55)</a>:</h4>
<p>I'll find out about crater run possibilities</p>



<a name="128676222"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676222" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> lqd <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676222">(Jun 26 2018 at 19:55)</a>:</h4>
<p>nice thank you</p>



<a name="128676225"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676225" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676225">(Jun 26 2018 at 19:55)</a>:</h4>
<p>(already asked in #rust-infra)</p>



<a name="128676234"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676234" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676234">(Jun 26 2018 at 19:55)</a>:</h4>
<p>ok so I guess the question is "what else" -- I know that <span class="user-mention" data-user-id="116266">@Santiago Pastorino</span> is looking into that one issue, and <span class="user-mention" data-user-id="116107">@David Wood</span> is looking into the region output</p>



<a name="128676280"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676280" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676280">(Jun 26 2018 at 19:56)</a>:</h4>
<p>ah I see some updates from <span class="user-mention" data-user-id="116118">@Matthew Jasper</span> too :)</p>



<a name="128676284"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676284" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676284">(Jun 26 2018 at 19:56)</a>:</h4>
<p>I guess an open question that I'd like your thoughts on</p>



<a name="128676292"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676292" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676292">(Jun 26 2018 at 19:56)</a>:</h4>
<p>is how to prioritize "completeness" and "soundness" bugs -- that is, things like ICEs, or failing to compile some code we think we should, or failing to report errors</p>



<a name="128676297"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676297" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676297">(Jun 26 2018 at 19:56)</a>:</h4>
<p>I'm having a hard time deciding :)</p>



<a name="128676304"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676304" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676304">(Jun 26 2018 at 19:56)</a>:</h4>
<p>I think maybe the first thing is to try and get a bit more of a survey though</p>



<a name="128676309"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676309" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676309">(Jun 26 2018 at 19:56)</a>:</h4>
<p>(e.g., via crater)</p>



<a name="128676326"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676326" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676326">(Jun 26 2018 at 19:57)</a>:</h4>
<p>I'd really like to get to the point where we can enable NLL warnings...performance still seems like a blocker there</p>



<a name="128676349"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676349" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676349">(Jun 26 2018 at 19:57)</a>:</h4>
<p><span class="user-mention" data-user-id="116118">@Matthew Jasper</span> I reassigned your PR from pnkfelix to me, seeing as they are out (as I wrote earlier)</p>



<a name="128676392"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676392" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> lqd <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676392">(Jun 26 2018 at 19:58)</a>:</h4>
<p>and the one ICE we talked about earlier might to be blocking some nightly users as well (even though I guess disabling NLL might have been an option)</p>



<a name="128676396"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676396" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676396">(Jun 26 2018 at 19:58)</a>:</h4>
<p>I should probaly do that for the rest of <a href="https://github.com/rust-lang/rust/pulls/assigned/pnkfelix" target="_blank" title="https://github.com/rust-lang/rust/pulls/assigned/pnkfelix">their PRs</a></p>



<a name="128676429"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676429" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676429">(Jun 26 2018 at 19:59)</a>:</h4>
<p>yeah, I guess my sense is that we should do a "triage look" over ICEs and things</p>



<a name="128676434"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676434" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> lqd <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676434">(Jun 26 2018 at 19:59)</a>:</h4>
<p>will eddy review your huge perf PR niko since felix is unavailable ?</p>



<a name="128676438"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676438" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676438">(Jun 26 2018 at 19:59)</a>:</h4>
<p>looking for ones that are either (a) blocking or affecting a lot of people or (b) will require some nontrivial refactorings to fix</p>



<a name="128676440"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676440" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676440">(Jun 26 2018 at 19:59)</a>:</h4>
<blockquote>
<p>will eddy review your huge perf PR niko since felix is unavailable ?</p>
</blockquote>
<p>hopefully <span class="emoji emoji-1f61b" title="stuck out tongue">:stuck_out_tongue:</span></p>



<a name="128676442"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676442" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676442">(Jun 26 2018 at 19:59)</a>:</h4>
<p>I should ping them</p>



<a name="128676444"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676444" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> lqd <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676444">(Jun 26 2018 at 19:59)</a>:</h4>
<p>:)</p>



<a name="128676456"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676456" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676456">(Jun 26 2018 at 19:59)</a>:</h4>
<p>(done)</p>



<a name="128676532"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676532" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676532">(Jun 26 2018 at 20:00)</a>:</h4>
<p>OK so — here are two organizational tasks I plan to do:</p>
<ul>
<li>further profiling</li>
<li>triaging of open issues</li>
</ul>



<a name="128676539"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676539" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676539">(Jun 26 2018 at 20:00)</a>:</h4>
<p>what I may do then is announce when I'll do them them and just open up a <a href="http://appear.in" target="_blank" title="http://appear.in">appear.in</a> channel for anyone who wants to hang out ;)</p>



<a name="128676550"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676550" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676550">(Jun 26 2018 at 20:00)</a>:</h4>
<p>I think this sort of thing would be slow to do over zulip</p>



<a name="128676566"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676566" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> qmx <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676566">(Jun 26 2018 at 20:01)</a>:</h4>
<p>niko, if you schedule it in advance more people can join</p>



<a name="128676571"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676571" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> qmx <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676571">(Jun 26 2018 at 20:01)</a>:</h4>
<p>:)</p>



<a name="128676575"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676575" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676575">(Jun 26 2018 at 20:01)</a>:</h4>
<p>it prob won't be today</p>



<a name="128676580"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676580" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676580">(Jun 26 2018 at 20:01)</a>:</h4>
<p>I was planning on picking some times tomorrow</p>



<a name="128676596"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676596" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jon Gjengset <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676596">(Jun 26 2018 at 20:01)</a>:</h4>
<blockquote>
<p>even though I guess disabling NLL might have been an option</p>
</blockquote>
<p>just a minor point on this: in my case, disabling NLL now that we've had it for a while would be quite a pain :)</p>



<a name="128676650"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676650" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676650">(Jun 26 2018 at 20:02)</a>:</h4>
<p><span class="user-mention" data-user-id="120054">@Jon Gjengset</span> which is your case?</p>



<a name="128676652"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676652" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676652">(Jun 26 2018 at 20:02)</a>:</h4>
<p>is that the ICE that <span class="user-mention" data-user-id="116113">@lqd</span> was referring to?</p>



<a name="128676662"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676662" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> lqd <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676662">(Jun 26 2018 at 20:02)</a>:</h4>
<p>yeah</p>



<a name="128676673"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676673" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jon Gjengset <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676673">(Jun 26 2018 at 20:03)</a>:</h4>
<p>yup, <a href="https://github.com/rust-lang/rust/issues/51348#issuecomment-400398622" target="_blank" title="https://github.com/rust-lang/rust/issues/51348#issuecomment-400398622">https://github.com/rust-lang/rust/issues/51348#issuecomment-400398622</a></p>



<a name="128676697"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676697" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jon Gjengset <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676697">(Jun 26 2018 at 20:03)</a>:</h4>
<p>(I have to run to a meeting, but will keep this open in case there are questions for me that I can answer later)</p>



<a name="128676763"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676763" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676763">(Jun 26 2018 at 20:04)</a>:</h4>
<p>ok, I'll try to poke that that briefly</p>



<a name="128676770"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676770" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676770">(Jun 26 2018 at 20:04)</a>:</h4>
<p>I'll open a dedicated Zulip topic on it and ping you from there</p>



<a name="128676772"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676772" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676772">(Jun 26 2018 at 20:04)</a>:</h4>
<p>I guess we're done here with this meeting?</p>



<a name="128676776"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676776" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676776">(Jun 26 2018 at 20:04)</a>:</h4>
<p>anybody have anything else on their minds?</p>



<a name="128676785"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676785" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> lqd <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676785">(Jun 26 2018 at 20:04)</a>:</h4>
<p>what to do with the perf issues ?</p>



<a name="128676805"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676805" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676805">(Jun 26 2018 at 20:05)</a>:</h4>
<p>I'd say if you see one you'd like to tackle, leave a comment and/or assign yourself, and feel free to ping me here</p>



<a name="128676806"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676806" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> lqd <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676806">(Jun 26 2018 at 20:05)</a>:</h4>
<p>say, do we wait a bit, in case more people want to pick them up ?</p>



<a name="128676813"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676813" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676813">(Jun 26 2018 at 20:05)</a>:</h4>
<p>I would not wait, if you have time and energy to hack :)</p>



<a name="128676817"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676817" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676817">(Jun 26 2018 at 20:05)</a>:</h4>
<p>I'm just saying don't like go grab 2 or 3 ;)</p>



<a name="128676830"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676830" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> lqd <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676830">(Jun 26 2018 at 20:05)</a>:</h4>
<p>:) understood</p>



<a name="128676831"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676831" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676831">(Jun 26 2018 at 20:05)</a>:</h4>
<p>that said, I think there may be a "connection" between 2 of them that I was pinging you about <span class="user-mention" data-user-id="116113">@lqd</span></p>



<a name="128676885"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676885" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676885">(Jun 26 2018 at 20:06)</a>:</h4>
<p>in particular #51819 and #51813 seem .. related?</p>



<a name="128676889"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676889" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676889">(Jun 26 2018 at 20:06)</a>:</h4>
<p>well, maybe the thing to do would be to focus just on liveness first</p>



<a name="128676892"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676892" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> lqd <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676892">(Jun 26 2018 at 20:06)</a>:</h4>
<p>yeah I saw you were saying it would make sense to do both at the same time</p>



<a name="128676898"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676898" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676898">(Jun 26 2018 at 20:06)</a>:</h4>
<p>and then split out the <code>do_dataflow</code> part, which is conceptually related but -- in terms of code -- entirely independent</p>



<a name="128676904"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676904" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676904">(Jun 26 2018 at 20:06)</a>:</h4>
<p>that is, I should prob split #51813 into two bugs</p>



<a name="128676921"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676921" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676921">(Jun 26 2018 at 20:07)</a>:</h4>
<p>but I think what I will do</p>



<a name="128676926"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676926" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676926">(Jun 26 2018 at 20:07)</a>:</h4>
<p>is to focus #51813 on <code>do_dataflow</code> and focus #51819 on liveness -- both its memory alloc problem + the laziness bit</p>



<a name="128676933"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676933" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> lqd <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676933">(Jun 26 2018 at 20:07)</a>:</h4>
<p>do you think bootstrap (or crater, for someone else say <span class="user-mention" data-user-id="116155">@Jake Goulding</span> wink wink) more "important" our new perf issues, seems like no ?</p>



<a name="128676981"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128676981" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> tmandry <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128676981">(Jun 26 2018 at 20:08)</a>:</h4>
<p><span class="user-mention" data-user-id="116009">@nikomatsakis</span> is the nll label the right place to start for anyone new looking to making a contribution?</p>



<a name="128677004"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677004" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> lqd <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677004">(Jun 26 2018 at 20:09)</a>:</h4>
<p>here the new ones are WG-compiler-nll + NLL-performant (the performance ones)</p>



<a name="128677068"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677068" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677068">(Jun 26 2018 at 20:10)</a>:</h4>
<p><span class="user-mention" data-user-id="116883">@Tyler Mandry</span> yeah so one thing I want to do is to simplify the NLL tracking issue</p>



<a name="128677082"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677082" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677082">(Jun 26 2018 at 20:10)</a>:</h4>
<p>but the NLL-performant and NLL-diagnostics labels are probably the two "main sources" of problems, though really all the NLL-foo labels are relevant</p>



<a name="128677083"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677083" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677083">(Jun 26 2018 at 20:10)</a>:</h4>
<p>if you see one that interests you :)</p>



<a name="128677098"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677098" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677098">(Jun 26 2018 at 20:11)</a>:</h4>
<blockquote>
<p>do you think bootstrap (or crater, for someone else say <span class="user-mention" data-user-id="116155">@Jake Goulding</span> wink wink) more "important" our new perf issues, seems like no ?</p>
</blockquote>
<p><span class="user-mention" data-user-id="116113">@lqd</span> good question -- I think perf is prob more imp't. Bootstrapping in partcular is more of a "background activity", I think</p>



<a name="128677105"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677105" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677105">(Jun 26 2018 at 20:11)</a>:</h4>
<p>the main work for crater run will be going through the <em>results</em> anyway</p>



<a name="128677106"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677106" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> lqd <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677106">(Jun 26 2018 at 20:11)</a>:</h4>
<p>don't we have traits + NLL intersections where <span class="user-mention" data-user-id="116883">@Tyler Mandry</span> could shine ?</p>



<a name="128677116"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677116" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677116">(Jun 26 2018 at 20:11)</a>:</h4>
<p>ah so there are a few things I didn't get arond to filing that I just remembered</p>



<a name="128677163"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677163" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677163">(Jun 26 2018 at 20:12)</a>:</h4>
<p>I want to verify, but I think that one of my PRs may have broken some of the rustc-perf test cases (notably futures)</p>



<a name="128677169"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677169" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677169">(Jun 26 2018 at 20:12)</a>:</h4>
<p>it was causing ICEs but <span class="user-mention" data-user-id="116083">@pnkfelix</span>  r+'d anyway and I didn't notice (though it's prob not a bad thing that it landed)</p>



<a name="128677170"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677170" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677170">(Jun 26 2018 at 20:12)</a>:</h4>
<p>in any case I think the fix is to introduce a new "query"</p>



<a name="128677175"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677175" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677175">(Jun 26 2018 at 20:12)</a>:</h4>
<p>(in the sense of chalk queries, <span class="user-mention" data-user-id="116883">@Tyler Mandry</span>)</p>



<a name="128677176"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677176" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677176">(Jun 26 2018 at 20:13)</a>:</h4>
<p>I'll try to file an issue about that</p>



<a name="128677183"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677183" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677183">(Jun 26 2018 at 20:13)</a>:</h4>
<p>there is also the bug on speeding up canonicalization</p>



<a name="128677247"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677247" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677247">(Jun 26 2018 at 20:14)</a>:</h4>
<p>this one: <a href="https://github.com/rust-lang/rust/issues/48417" target="_blank" title="https://github.com/rust-lang/rust/issues/48417">https://github.com/rust-lang/rust/issues/48417</a></p>



<a name="128677248"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677248" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677248">(Jun 26 2018 at 20:14)</a>:</h4>
<p>I just tagged it with NLL-performant</p>



<a name="128677254"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677254" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677254">(Jun 26 2018 at 20:14)</a>:</h4>
<p>I'm not sure what technicalguy's story is, they didn't answer my pings over on discord</p>



<a name="128677303"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677303" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> tmandry <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677303">(Jun 26 2018 at 20:15)</a>:</h4>
<p>okay sounds good, I'll take a closer look at that one soon. also ping me if you create the other issue.</p>



<a name="128677353"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677353" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677353">(Jun 26 2018 at 20:16)</a>:</h4>
<p>ok, let me go see if there are still problems with ICEs</p>



<a name="128677359"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677359" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677359">(Jun 26 2018 at 20:16)</a>:</h4>
<p>I also want to investigate <span class="user-mention" data-user-id="120054">@Jon Gjengset</span>'s problem</p>



<a name="128677363"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677363" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677363">(Jun 26 2018 at 20:16)</a>:</h4>
<p>ok, end of meeting? :)</p>



<a name="128677375"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677375" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> lqd <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677375">(Jun 26 2018 at 20:16)</a>:</h4>
<p><span class="emoji emoji-1f44d" title="thumbs up">:thumbs_up:</span> :)</p>



<a name="128677377"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677377" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677377">(Jun 26 2018 at 20:17)</a>:</h4>
<p>thanks all! &lt;3</p>



<a name="128677388"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128677388" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> lqd <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128677388">(Jun 26 2018 at 20:17)</a>:</h4>
<p>cheers everyone</p>



<a name="128680286"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128680286" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128680286">(Jun 26 2018 at 21:08)</a>:</h4>
<blockquote>
<p>okay sounds good, I'll take a closer look at that one soon. also ping me if you create the other issue.</p>
</blockquote>
<p><span class="user-mention" data-user-id="116883">@Tyler Mandry</span> so I can no longer reproduce those failures, but I feel like the underlying problem is not fixed, I think we're just missing the asserts now =) gonna try to add them back...</p>



<a name="128680319"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128680319" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128680319">(Jun 26 2018 at 21:09)</a>:</h4>
<p>hm, maybe not</p>



<a name="128680368"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128680368" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128680368">(Jun 26 2018 at 21:10)</a>:</h4>
<p>well I still think there's a problem and will try to write it up, but I guess the urgency is low until I find a way to have something fail ;)</p>



<a name="128720051"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128720051" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Eh2406 <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128720051">(Jun 27 2018 at 15:00)</a>:</h4>
<p>I just joined <code>zulip</code> to ping you, <strong>@nikomatsakis</strong>. Am I pinging correctly?</p>



<a name="128720169"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128720169" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Eh2406 <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128720169">(Jun 27 2018 at 15:02)</a>:</h4>
<p>Specifically, I may have a  spare cycal to take a stab at 51821.</p>



<a name="128720866"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128720866" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128720866">(Jun 27 2018 at 15:16)</a>:</h4>
<p>you are :)</p>



<a name="128720868"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128720868" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128720868">(Jun 27 2018 at 15:16)</a>:</h4>
<p>great!</p>



<a name="128720873"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128720873" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128720873">(Jun 27 2018 at 15:16)</a>:</h4>
<p>did the instructions make sense to you?</p>



<a name="128721178"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128721178" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Eh2406 <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128721178">(Jun 27 2018 at 15:20)</a>:</h4>
<p>I think 50-70%. I am working on getting an jetbrains/rls to work on the relevant files so I can fill in some of the blanks, or adeast get to where I can articulate what I don't understand.</p>



<a name="128721205"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128721205" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128721205">(Jun 27 2018 at 15:21)</a>:</h4>
<p>ok, sounds good</p>



<a name="128721324"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128721324" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Eh2406 <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128721324">(Jun 27 2018 at 15:23)</a>:</h4>
<p>From a clean checkout I seem to be getting "failed to read <code>C:\rust_things\rust\src\tools\clippy\Cargo.toml</code>" thoughts? Do I need to start a build :-(</p>



<a name="128721676"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128721676" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128721676">(Jun 27 2018 at 15:31)</a>:</h4>
<p>probably</p>



<a name="128721679"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128721679" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128721679">(Jun 27 2018 at 15:31)</a>:</h4>
<p>and/or various <code>git</code> commands to update the submodules</p>



<a name="128721681"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128721681" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128721681">(Jun 27 2018 at 15:31)</a>:</h4>
<p>I would do <code>./x.py check</code></p>



<a name="128721998"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128721998" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jake Goulding <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128721998">(Jun 27 2018 at 15:38)</a>:</h4>
<p>maybe <code>git submodule update</code></p>



<a name="128722684"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128722684" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128722684">(Jun 27 2018 at 15:51)</a>:</h4>
<p>I'd suggest <code>git submodule update --init --recursive</code> if you're having submodule issues</p>



<a name="128722834"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128722834" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jon Gjengset <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128722834">(Jun 27 2018 at 15:54)</a>:</h4>
<p><span class="user-mention" data-user-id="116009">@nikomatsakis</span> you mentioned you'd open a dedicated topic for <a href="https://github.com/rust-lang/rust/issues/51348" target="_blank" title="https://github.com/rust-lang/rust/issues/51348">https://github.com/rust-lang/rust/issues/51348</a>. I'm new to Zulip — where would I find that topic?</p>



<a name="128723666"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128723666" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Eh2406 <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128723666">(Jun 27 2018 at 16:08)</a>:</h4>
<p>So while that runs I see 2 questions, that I may be able to answer for myself with a working editor, but you may just know:<br>
1, how does the vec constraints end up calling add_region?<br>
2, is <code>ConstraintIndex</code> use anywhere? The places <code>IndexVec</code> are added to from 51821 don't record it.</p>



<a name="128723896"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128723896" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> davidtwco <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128723896">(Jun 27 2018 at 16:11)</a>:</h4>
<p>Just an FYI <span class="user-mention" data-user-id="120179">@Eh2406</span>, you should create a new topic in the <a class="stream" data-stream-id="122657" href="/#narrow/stream/122657-wg-nll">#wg-nll</a> stream to keep any questions related to your issue in one place - it's easier to find later on and for catching up.</p>



<a name="128724353"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128724353" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Eh2406 <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128724353">(Jun 27 2018 at 16:20)</a>:</h4>
<p>@David Wood never used zulip before how do I do that, sorry.</p>



<a name="128724385"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128724385" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> davidtwco <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128724385">(Jun 27 2018 at 16:21)</a>:</h4>
<p><span class="user-mention" data-user-id="120179">@Eh2406</span> No worries, if you don't have a message to reply to selected (if you do, there's a little cross to close that above the text box on the right) then there's a "new topic" button. Then you just type a name and a message.</p>



<a name="128726032"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128726032" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128726032">(Jun 27 2018 at 16:54)</a>:</h4>
<p><span class="user-mention" data-user-id="120054">@Jon Gjengset</span> I don't think I ever did, I think I said I <em>would</em></p>



<a name="128726037"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128726037" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128726037">(Jun 27 2018 at 16:54)</a>:</h4>
<p>but I didn't get to it :)</p>



<a name="128727166"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128727166" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jon Gjengset <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128727166">(Jun 27 2018 at 17:18)</a>:</h4>
<p>Haha, I see. No worries! I see you managed to build an even simpler reproducing example!</p>



<a name="128727197"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128727197" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128727197">(Jun 27 2018 at 17:19)</a>:</h4>
<p>yeah so I see what the problem is, but not the ideal fix</p>



<a name="128727199"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128727199" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128727199">(Jun 27 2018 at 17:19)</a>:</h4>
<p>it intersects with recent work by <span class="user-mention" data-user-id="116083">@pnkfelix</span> that I have to review</p>



<a name="128727271"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128727271" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128727271">(Jun 27 2018 at 17:20)</a>:</h4>
<p>however, if you need a workaround, it seems clear you could have one</p>



<a name="128727280"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128727280" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jon Gjengset <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128727280">(Jun 27 2018 at 17:20)</a>:</h4>
<p>Oh, yeah, we could easily re-write the code to not have that happen</p>



<a name="128727283"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/122657-t-compiler/wg-nll/topic/weekly%20meeting%20June%2026/near/128727283" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jon Gjengset <a href="https://rust-lang.github.io/zulip_archive/stream/122657-t-compiler/wg-nll/topic/weekly.20meeting.20June.2026.html#128727283">(Jun 27 2018 at 17:20)</a>:</h4>
<p>Now that we know what the issue is</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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